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Popular >

x^4-16x^2-225>= 0

Solution

x^{4} - 16 x^{2} - 225 \geq 0

Solution

x \leq - 5 or x \geq 5

+1

Solution steps

x^{4} - 16 x^{2} - 225 \geq 0

Factor

x^{4} - 16 x^{2} - 225 : (x^{2} + 9) (x + 5) (x - 5)

(x^{2} + 9) (x + 5) (x - 5) \geq 0

Identify the intervals

x \leq - 5 or x \geq 5

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Frequently Asked Questions (FAQ)

What is x^4-16x^2-225>= 0 ?
The solution to x^4-16x^2-225>= 0 is x<=-5\lor x>= 5